Definitions of belle:

• noun:   a young woman who is the most charming and beautiful of several rivals

  Example: "She was the belle of the ball"

• name:  A female given name (rare: 1 in 14285 females; popularity rank in the U.S.: #1064)
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #7433)